Bifunctional One-Component Catalysts for the Addition of Carbon Dioxide to Epoxides
作者:Hendrik Büttner、Kornelia Lau、Anke Spannenberg、Thomas Werner
DOI:10.1002/cctc.201402816
日期:2015.2
Several bifunctional ammonium salts were synthesized and employed as one‐component catalysts for the conversion of CO2 and epoxides to produce cyclic carbonates. These catalysts show superior activities compared to their monofunctional analogs. A turnover number of up to 693 and a turnover frequency of up 392 h−1 could be achieved for the best catalyst. Moreover, the effect of various solvents has
合成了几种双功能铵盐,并将其用作单组分催化剂,用于将CO 2和环氧化物转化为环状碳酸酯。与它们的单官能类似物相比,这些催化剂显示出优异的活性。周转次数最多为693,周转频率最多为392 h -1可以达到最佳催化剂的效果。此外,已经研究了各种溶剂的作用。所有使用的溶剂和形成的产物对底物转化率都有负面影响。对于两种常规反应方案,分别在45和90°C下仔细研究了反应的范围和限制。在超过20个示例中,过滤后的分离产率为90%。此外,我们提出了环己烯基天然存在的环状碳酸酯的首次有机催化合成,其分子结构由XRD确定。此外,我们证明了该反应甚至可以在数克范围内进行,并且可以通过原位FTIR光谱进行监测。
Synthesis of Cyclic Carbonates from Epoxides and Carbon Dioxide by Using Bifunctional One-Component Phosphorus-Based Organocatalysts
作者:Hendrik Büttner、Johannes Steinbauer、Thomas Werner
DOI:10.1002/cssc.201500612
日期:2015.8.24
Numerous bifunctionalorganocatalysts were synthesized and tested for the atom‐efficient addition of carbondioxide and epoxides to produce cyclic carbonates. These catalysts are based on phosphonium salts containing an alcohol moiety in the side chain for substrate activation through hydrogen bonding. In the model reaction, converting 1,2‐butylene oxide with CO2, 19 catalysts were tested to determine
Catalytic synthesis of organic cyclic carbonate through CO2 fixation and production of β-amino alcohol via ring opening of epoxides under green condition by polystyrene embedded Al(III) catalyst
作者:Surajit Biswas、Dipanwita Roy、Swarbhanu Ghosh、Sk Manirul Islam
DOI:10.1016/j.jorganchem.2019.120877
日期:2019.10
for the production of fine organic chemicals such as organic cyclic carbonates and 2-amino alcohols under green and mild reaction conditions. Organic cyclic carbonates were synthesized through the insertion of carbon dioxide into epoxides at room temperature under solvent freecondition. The developed protocol of catalytic synthesis of cyclic carbonates is sustainable, eco-friendly and cost-effective
[reaction: see text] Epoxides dissolved in molten tetralkylammonium salts bearing halides as counterions are converted into cycliccarbonates under atmospheric pressure of carbondioxide. The reaction rate depends on the nucleophilicity of the halide ion as well as the structure of the cation.
A Zn(<scp>ii</scp>)-functionalized COF as a recyclable catalyst for the sustainable synthesis of cyclic carbonates and cyclic carbamates from atmospheric CO<sub>2</sub>
作者:Somnath Sarkar、Swarbhanu Ghosh、Sk. Manirul Islam
DOI:10.1039/d1ob01938d
日期:——
various substituents under sustainable conditions. A variety of terminal epoxides and slightly more complicated disubstituted epoxides were transformed into the corresponding cyclic carbonates with satisfactory to excellent yields (i.e., 69 to 99% yield) upon exposure to CO2 (1 atm) undersolvent-freeconditions (sustainable approach). On the other hand, this ZnII-loaded covalent organic framework also displayed
报道了一种带有 β-酮烯胺单元的简单共价有机框架 (COF) 作为潜在的多相配体,用于 Zn II催化的固定和 CO 2转化为增值化学品。催化研究令人信服地证明,Zn II官能化共价有机骨架(Zn@TpTta)在可持续条件下对具有各种取代基的各种环氧化物的 CO 2固定表现出完美的催化活性。多种末端环氧化物和稍微复杂的二取代环氧化物在暴露于 CO 2时转化为相应的环状碳酸酯,产率令人满意至极好(即69 至 99% 产率)(1 atm) 在无溶剂条件下(可持续方法)。另一方面,这种载有 Zn II的共价有机框架在促进大气环化 CO 2捕获方面也表现出优异的性能,这导致使用N从不饱和胺系统中形成不同的环状氨基甲酸酯(即产率 61% 至 94%)。-碘代琥珀酰亚胺 (NIS) 作为碘化剂,PEG-400 在无碱条件下作为可生物降解的绿色聚合物溶剂(可持续方法)。新合成的基于 COF 的催化剂,即